Measure AC voltage between the lead wires at 3 points.
9-time flash

10-5. TROUBLESHOOTING FLOW

A How to check inverter/compressor

Disconnect the connector (CN61) between compressor and the intelligent power module (IPM).

Check the voltage between terminals.

Are the voltages balanced?

Yes

Check the compressor.

See 10-5. “Check of open phase”.

No

Replace the inverter P.C. board.

 

See 10-5. “Check of compressor”.

B Check of open phase

●With the connector between the compressor and the intelligent power module disconnected, activate the inverter and check if the inverter is normal by measuring the balance of voltage between the terminals.

Output voltage 115 V

<< Operation method>>

Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit. (TEST RUN OPERATION : Refer to 7-6.)

<<Measurement point>> at 3 points

BLK (U) - WHT (V)

BLK (U) - RED (W)

WHT(V) - RED (W)

2.5-second OFF

NOTE: 1. Output voltage varies according to power supply voltage.

2.Measure the voltage by analog type tester.

3.During this check, LED of the inverter P.C. board flashes 9 times. (Refer to 10-6.1.)

C Check of compressor

Refer to 10-5. “Check of compressor winding”.

Is the compressor normal? Yes

Refer to 10-5. “Check of compressor operation time”.

Does the compressor operate continuously? Yes

OK.

 

 

Replace the compressor.

No

 

 

 

Refer to 10-5. “Check of compressor start failure”.

No

 

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Mitsubishi Electronics MUZ-FD12NA- U1 How to check inverter/compressor, Check of open phase, Check of compressor
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MUZ-FD09NA- U1, MUZ-FD12NA- U1, MUZ-FD12NA, MUZ-FD09NA specifications

The Mitsubishi Electronics MUZ-FD09NA is a highly efficient and versatile air conditioning unit designed for both residential and light commercial applications. This model is part of Mitsubishi's advanced range of split-system air conditioners which emphasize energy efficiency, comfort, and innovative technology.

One of the standout features of the MUZ-FD09NA is its energy efficiency. The unit boasts an impressive SEER (Seasonal Energy Efficiency Ratio) rating, which translates to reduced energy consumption and lower utility bills. This makes it an eco-friendly option for users looking to minimize their carbon footprint while enjoying comfortable indoor climates year-round.

The MUZ-FD09NA utilizes advanced inverter technology, which enables the compressor to adjust its speed based on the cooling or heating demand. This not only enhances comfort by maintaining a steady temperature but also significantly reduces energy consumption compared to traditional fixed-speed systems. Additionally, the inverter technology allows for quieter operation, making it ideal for use in bedrooms or study areas where noise can be disruptive.

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The MUZ-FD09NA is designed to operate in a wide range of temperatures, making it suitable for various climates. It can effectively provide cooling in the summer and heating in the winter, ensuring comfort throughout the year.

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Overall, the Mitsubishi Electronics MUZ-FD09NA combines energy efficiency, advanced technology, and user-friendly features, making it a reliable choice for maintaining a comfortable indoor environment. Whether for residential or light commercial use, this air conditioning unit stands out as an effective solution for climate control needs.
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